SDSS J153231.80+420342.7: a triple black hole candidate with a close binary black hole

Qi Zheng, YiWen Jiang, Xue-Guang Zhang +1

We report a triple black hole candidate with a close binary black hole (BBH) in the blue quasar SDSS J153231.80+420342.7 (=SDSS J1532) at a redshift of 0.209. It shows double-peake…